Diamond-tungsten carbide nanocomposite

Sergii Nazarchuk 1Oleksand Bochechka 1Stanisław Gierlotka 2Igor Dzięcielewski 2Mykola Gadzyra 3

1. V. Bakul Institute for Superhard Materials of the National Academy of Sciences of Ukraine (ISM), 2, Avtozavodska Str., Kyiv 04074, Ukraine
2. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
3. Institute for Problems of Materials Science, 3, Krzhizhanovsky, Kyiv 03142, Ukraine


Nanopowder mixtures of ASM5 0.1/0 diamond, and WO3 were formed in the liquid. Air drying and thermal treatment of these mixtures in hydrogen were carried out. Composites were HP sintered from them [1, 2]. The structure and phase composition of the mixtures and sintered composites have been studied.

The WO3 particle size is in the range of 150–250 nm, the particles are fragmented, the grain size varies from 10 to 150 nm. The size of the diamond particles does not exceed 100 nm. The relative position of the particles of diamond and WO3 is homogeneous enough, however, a tendency to agglomerate particles is observed (fig. 1).

Fig. 1. The structure of the mixture of ASM5 0.1/0 statically synthesized diamond nanopowder and tungsten trioxide powder (46%) formed in a liquid after drying before annealing in hydrogen

 During the mixture heat treatment in hydrogen at the temperature of 900 °C the complete recovery of WO3 to the metal tungsten occurs. In case of deviation from the heat treatment the W3O oxide is present in the mixture, together with metallic tungsten and WO2. The particle size of formed tungsten increased by 2–3 times compared to the WO3 precursor particles (fig. 2). The formed particles are less fragmented.



Fig. 2. Structure of the mixture of diamond nanopowder and tungsten trioxide after annealing in hydrogen obtained by SEM  at different magnifications (a, b)

 The diamond and WC are the main phases in the composite sintered from the mixture which includes WO2, apart from diamond and tungsten. A small amount of W and WO2 is also present. Amount of WO2 has not changed compared to the initial mixture (fig. 3). WC formed as a result of the diamond and tungsten reaction is in the interspaces between the diamond particles and improves the connection between them (fig. 4). While the presence of WO2 in the interspaces worsens the connection.



Fig. 3. Diffractogram (a) and diffraction pattern (b) of composite sintered from a mixture of diamond nanopowder and tungsten powder treatment in hydrogen

Fig. 4. The structure of the surface obtained by shearing the sintered composite sample


[1]    S.N. Nazarchuk, A.A. Bochechka, V.S. Gavrilova, L.A. Romanko, N.N. Belyavina, L.I. Alexandrova, V.N. Tkach, E.F. Kuzmenko, S.D. Zabolotnyi, J. Superhard Materials, 2011, vol. 33, no. 1, pp. 1–12.

[2]    M.V. Novіkov, A.A .Bochechka, S.M. Nazarchuk, V.S. Gavrilova, G.S. Oleinik, L.A. Romanko, I.A. Sveshnіkov, S.D. Zabolotny. Patent of Ukraine 93803, Publ. 10.03.11. Byul. 5.

Legal notice
  • Legal notice:

    Copyright (c) Pielaszek Research, all rights reserved.
    The above materials, including auxiliary resources, are subject to Publisher's copyright and the Author(s) intellectual rights. Without limiting Author(s) rights under respective Copyright Transfer Agreement, no part of the above documents may be reproduced without the express written permission of Pielaszek Research, the Publisher. Express permission from the Author(s) is required to use the above materials for academic purposes, such as lectures or scientific presentations.
    In every case, proper references including Author(s) name(s) and URL of this webpage: http://science24.com/paper/30196 must be provided.


Related papers
  1. Analysis of density waves in CdSe, SiC, and diamond nanocrystals by application of NanoPDF software package to experimental Pair Distribution Functions.
  2. Crystallite size determination from diffraction data: a do-it-yourself tutorial.  
  3. High-pressure diffraction study of structural and elastic properties of zircon-type and scheelite-type RVO4 (R = Nd, Eu)
  4. Looking at the real structure of nanocrystals with powder diffraction: the apparent lattice parameter approach
  5. Looking beyond limitations of diffraction methods of structural analysis of nanocrystalline materials
  6. Growth of GaN layers on silicon and sintered GaN nano-ceramic substrates – TEM investigations
  7. Growth and properties of ytterbium doped KY(WO4)2 nanocomposites
  8. Dyfraktometryczna analiza mikro- i makro-naprężeń w spiekach i kompozytach otrzymanych pod wysokim ciśnieniem i wysoką temperaturą.
  9. Badania własności termicznych nanokryształów metodami dyfraktometrycznymi
  10. Fabrication and micro-structure characterization of Al2O3/Ni-P composites with interpenetrating phases
  11. Nanocrystalline SiC compacts obtained by sintering of laser synthesized nanopowders under extreme pressures
  12. High-pressure Induced Structural Decomposition of RE-doped YAG Nanoceramics
  13. Sintering of nanopowders under high pressure
  14. Synthesis and properties of GaAs nano-composites
  15. SiC-Zn nanocomposites obtained using high-pressure infiltration technique
  16. Sintering temperature effect on structure and properties of Al2O3/Ni-P composites with interpenetrating phases
  17. Structural and luminescence properties of yttrium-aluminum garnet (YAG) nanoceramics
  18. Fabrication and electrical properties of Eu3+:BaTiO3 nanoceramics for SOFC
  19. X-ray diffraction studies of thermal properties of bulk- and surface-atoms of nanocrystalline SiC
  20. Characterization of nanostructured hydroxyapatite ceramics densified at high-pressure and temperature
  21. Powder precursors for nanoceramics: cleaning and compaction
  22. Examination of the atomic Pair Distribution Function (PDF) of SiC nanocrystals by in-situ high pressure diffraction
  23. Investigation of the microstructure of SiC-Zn nanocomposites by microscopic methods: SEM, AFM and TEM
  24. Sythesis of metal-ceramic nanocomposites by high-pressure infiltration
  25. X-Ray investigations of the natural and artificial White Etching Layer
  26. The influence of temperature and pressure on possibility of obtaining Al2O3/Ni-P nanocomposite through hot pressing process.
  27. X-Ray Characterization of Nanostructured Materials
  28. Generetion and Relaxation of Strain in SiC and GaN under Extreme Pressure
  29. Influence of high pressure on the polytype structure of nanocrystalline GaN
  30. Transformation of fractal microstructure of nanocrystalline SiC and diamond in high pressures - Small Angle Scattering Study
  31. Synthesis of Nanocomposites Based on Superhard Ceramic Nanopowders

Presentation: Poster at Nano and Advanced Materials Workshop and Fair, by Sergii Nazarchuk
See On-line Journal of Nano and Advanced Materials Workshop and Fair

Submitted: 2013-06-07 14:42
Revised:   2013-06-10 13:01
Web science24.com
© 1998-2021 pielaszek research, all rights reserved Powered by the Conference Engine